Mechanical tests of the external fixator of the hand – analyse of the three-dimensional spacing of the bone implants to the stability of bone fracture fixing

Abstract eng:
The aim of the study was to present influence of the three-dimensional spacing of the bone implants to the stability of bone fracture fixing in biplane external stabilizer for small bones. The bone chips are fastened by two pairs of Kirschner’s wires settled in the frames with can displace along two pins. The various kind of the bone fractures were tested. The analyze was made for the tension, torsion, bending and compression for the different bone fracture configuration. Introduction An external fixation of the bone fragments does not require other immobilization in plaster cast. It leads to earlier rehabilitation and of the patient .It concerns not only small bone fragments but also long bones as well as the fractures of the pelvis. This method can be also used for lengthening or shortening bones. During treatment in most cases the functionality of the fixed limb is kept. The external fixation although laden with a certain defects in comparison with internal stabilisation ( e.g. suppuration ,injury of nerves end vessels) is less invasive and in some cases could be applied ambulatory. Object of the study The presented fixator ( Fig.1) is the original compression-distraction instrument for external stabilization of small bone fragments. During construction an easiness of assembly and a correction bone chips position was taken to consideration. The Kirschner’s wires perform implant function of bone grafts. The system consists of the four equal kinematics pairs. The basis make two pines M-5 (1) on which are situated bodies (2) for wires fixation (3). Fixation ad positioning the bodies of any place the pines is defined by two nuts (4) for every kinematics’ pairs. There are screws with a plate fixed (5) in the bodies which locate and fasten the wires determines simultaneously mutual location of the pines. It influences rigidity of all system. Either of the 1 2

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